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September 18, 2019

Solution to problems – class 9 – Set 1 Q 60


Problem Statement

60) A metallic sphere of mass 2 kg and volume 2.5 x 10-4 m3 is completely immersed in water.

Find the buoyant force exerted by water on the sphere.
Density of water = 1000 kg/m3

Solution

Volume of the water displaced = volume of the completely immersed sphere=2.5 x 10-4 m3


Mass of the displaced water = volume x density = 2.5 x 10-4 x 1000 kg =0.25 kg

Weight of the displaced water = 0.25 * 9.8 N =2.45 N

The buoyant force is 2.45 N


Question Set – Physics Problems for grade 9

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